[Nisgeis]

There are a number of effects that disappear if the point source of the effect is out of frustum. I think, but I haven't chacked, that this is the case with the search lights, e.g. when the searchlight is off camera, the searchlight beam is not drawn. This is also noticable in the unmodified smokestacks. Smoke disappears and is not emitted when the funnel is off camera.